Samba share access audit log

[DavidePrincipi]

Configure the vfs_audit_full Samba plugin to store, search, and retrieve share access events in an audit log.

NS7 samba audit module parses text log files and inserts audit events in a MySQL database.

References:

• Samba plugin: https://www.samba.org/samba/docs/current/man-html/vfs_full_audit.8.html
• Discussion: https://mattermost.nethesis.it/nethesis/pl/tt7jiz68zjy5tpjyiq5jm7ki5r
• NS7 module: https://github.com/NethServer/nethserver-samba-audit/blob/master/root/etc/logrotate.d/smbaudit